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Coebergh JW, Verhagen-Teulings MT, Crommelin MA, van der Heijden LH, Hop WC.Coebergh JW, et al.Ned Tijdschr Geneeskd. 1991 May 25;135(21):938-43.Ned Tijdschr Geneeskd. 1991.PMID: 2052110Dutch.